Which one of the following collection times is correctly described?

A$)$ Mailing time begins when a firm mails out a billing statement and ends when the payment is received.

B$)$

Processing delay begins when a firm mails out billing statements and ends when the firm deposits the payment for that statement into its bank account.

C$)$ The processing delay starts when a firm mails out a billing statement and ends when the payment is received from a customer.

D$)$ Availability delay begins when a firm deposits a customer's check into its bank account and ends when the cash from that payment is available to the firm. $q,$ E$)$ Collection time begins when a firm mails out a billing statement and ends when the cash payment for that billing is available to the firm.